// Copyright (C) 2018-2025 Free Software Foundation, Inc.
//
// This file is part of the GNU ISO C++ Library.  This library is free
// software; you can redistribute it and/or modify it under the
// terms of the GNU General Public License as published by the
// Free Software Foundation; either version 3, or (at your option)
// any later version.

// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.

// You should have received a copy of the GNU General Public License along
// with this library; see the file COPYING3.  If not see
// <http://www.gnu.org/licenses/>.

// { dg-do compile { target c++17 } }

#include <iostream>
#include <filesystem>

using namespace std::filesystem;

struct P {
  operator path&();
};

void foo(std::iostream& s) {
  P p;
  s << p; // { dg-error "no match" }
  s >> p; // { dg-error "no match" }
}
// { dg-prune-output "no type .*enable_if" }
// { dg-prune-output "template constraint failure" }
